Primordial black holes and gravitational waves from resonant amplification during inflation
Primordial black holes and gravitational waves from resonant amplification during inflation
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DOI：
10.1103/physrevd.102.103527
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发表时间：
2020-10
影响因子：
5
通讯作者：
Zihan Zhou;Jie Jiang;Yi-Fu Cai;M. Sasaki;Shi Pi
中科院分区：
文献类型：
--
作者：
Zihan Zhou;Jie Jiang;Yi-Fu Cai;M. Sasaki;Shi Pi
在一个两阶段膨胀模型中，我们提出了一种新的实现原始黑洞和引力波的共振产生的方法，该模型由一个具有轴子-单轴周期结构的标量场\Phi和另一个具有山顶势能的场\X_i组成，前者控制第一阶段，后者控制第二阶段。第一阶段由周期结构引起的参数共振放大了哈勃半径内两场的微扰。虽然背景轨迹的演化随着振荡势垒高度的增加而经历一个转折，但放大的CHI扰动保持不变，并对最终的曲率扰动做出贡献。事实证明，原始功率谱在小尺度上显示出显著的共振峰，这可以导致原始黑洞的大量产生。此外，在膨胀过程中，引力波也是由共振增强的场扰动产生的，其幅度可能会受到未来引力波干涉仪的限制。
We present a new realization of the resonant production of primordial black holes as well as gravitational waves in a two-stage inflation model consisting of a scalar field \phi with an axion-monodromy-like periodic structure in the potential that governs the first stage and another field \chi with a hilltop-like potential that dominates the second stage. The parametric resonance seeded by the periodic structure at the first stage amplifies the perturbations of both fields inside the Hubble radius. While the evolution of the background trajectory experiences a turn as the oscillatory barrier height increases, the amplified perturbations of \chi remain as they are and contribute to the final curvature perturbation. It turns out that the primordial power spectrum displays a significant resonant peak on small scales, which can lead to an abundant production of primordial black holes. Furthermore, gravitational waves are also generated from the resonantly enhanced field perturbations during inflation, the amplitude of which may be constrained by future gravitational wave interferometers.